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| David's Mini Lathe...... |
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| Stilldrillin:
Managed some workshop time, yesterday. While I was busy, I set the lathe running in Lo gear, 700 rpm. Tweaked the bearings, after 10mins, and upped the revs. Eventually reaching peak revs in Lo, 2,180. (Seems rather high to me)...... :scratch: All seemed ok, so I changed to Hi gear. Ran for a while, eventually reaching 3,000rpm. The supposed peak revs. Wound it up, a bit. Reached 3,600. The digital reading stayed there, but the revs continued to obey the speed control. The bearings seemed happy. Not getting warm at all. So, I tweaked the speed control a bit more... The revs climbed higher! Until the motor cut out, with a, "PUP". :zap: Apparently, no harm done! (Except to my nerves). It re-started, as usual. :thumbup: Grabbing my laser tacho, I decided to see just what were the peak revs? :scratch: It peaked at 5,000rpm!! :bugeye: .. Before going, "PUP", :zap: again. That's just a bit too enthusiastic, for my liking....... :palm: Time to check the motor. Should give 6,000rpm. According to the label..... Reflector tape, on the pulley...... By ek! We must have the GT model....... John suggested checking the voltage supplied to the motor. As, this determines the motor speed. The result wasn't helped by my 35yr old meter reading x 2(+). 500+ volts! I don't think so....... New meter on order. Further fumblings, in a few days time. Any comments/ helpful advice gratefully accepted...... :thumbup: |
| Stilldrillin:
The new multi meter arrived, early this afternoon. After a bit of familiarisation, :zap: I checked the full revs voltage to the motor. That's, ok...... John suggested, I check the speed pot, R3. As the other two, are sealed, with gloop. I guess, someone has twiddled with R3...... I set the lathe running, sensible revs. Rotated R3 anticlock. The revs reduced! :ddb: 1/4 turn at a time, on R3, while increasing the speed knob setting. After almost 2 turns, we hit a "stop". Flat out at....... Guess the "stop/ resistance" was the original position of the pot. I'll leave it alone from now on. Probably. :thumbup: Sincerest thanks to Mr. Rudd, for his help and guidance, through fings wot most of us don't understand. :mmr: |
| Stilldrillin:
Spent ten mins in a perrishin' cold workshop, today. The lathe produced blue swarf, from a piece of 1" dia unknown steel, just as I hoped it would. :headbang: I now have the rest of the winter/ springtime to bed it in. While making a few mods to my original, mongrel mini lathe. :thumbup: |
| Meldonmech:
A very interesting post. Cheers David |
| Stilldrillin:
--- Quote from: Meldonmech on December 09, 2019, 08:16:56 AM --- A very interesting post. Cheers David --- End quote --- Thank you, David! Nothing much of interest will happen, over the next few (cold), months. If/ when it does. I'll post pics etc. Incidentally. The next owner, says he would like a Dixon toolpost installing. Before delivery..... :palm: |
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